@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Orbitron:wght@500;700&family=Fira+Code:wght@400;600&display=swap');

:root {
    --bg-light: #f6f7f1;
    --surface-light: #ffffff;
    --surface-dark: #222230;
    --text-primary-light: #0b1220;
    --text-secondary-light: #6b7280;
    --text-primary-dark: #fbfef9;
    --text-secondary-dark: #9ca3af;
    --accent-coral: #ff7a59;
    --dev-bg: #121814;
    --dev-surface: #1a241e;
    --dev-green: #22c55e;
    --dev-green-glow: rgba(34, 197, 94, 0.15);
    --contact-bg: #181419;
    --contact-glow: rgba(255, 122, 89, 0.12);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: 'Inter', ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-light);
    color: var(--text-primary-light);
    line-height: 1.5;
}

img {
    display: block;
    max-width: 100%;
}

a {
    color: inherit;
}

button,
input,
textarea {
    font: inherit;
}

.topbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(15, 23, 42, 0.08);
    transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.topbar-content {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.button-topbar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 16px;
    border-radius: 999px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.85rem;
    transition: opacity 0.2s ease;
}

.button-topbar:hover {
    opacity: 0.8;
    cursor: pointer;
}

.section-panel {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 88px 20px 60px;
    box-sizing: border-box;
}

.hero-container-wrapper,
.projects-container-wrapper,
#section-3 .panel-inner {
    width: min(100%, 1000px);
    margin: 0 auto;
}

#section-1 {
    background: var(--bg-light);
    color: var(--text-primary-light);
    align-items: flex-start;
}

#section-2 {
    background-color: var(--dev-bg);
    background-image:
        linear-gradient(to right, rgba(34, 197, 94, 0.07) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(34, 197, 94, 0.07) 1px, transparent 1px);
    background-size: 32px 32px;
    color: var(--dev-green);
    font-family: 'Fira Code', monospace;
}

#section-3 {
    background-color: var(--contact-bg);
    background-image:
        radial-gradient(circle at 50% 50%, rgba(255, 122, 89, 0.15) 0%, rgba(25, 25, 35, 0.6) 70%),
        linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 100% 100%, 48px 48px;
    color: var(--text-primary-dark);
}

.topbar.section-1 {
    background: rgba(251, 254, 249, 0.95);
    color: var(--text-primary-light);
    border-bottom-color: rgba(11, 23, 42, 0.06);
}

.topbar.section-2 {
    background: rgba(18, 24, 20, 0.95);
    color: var(--dev-green);
    border-bottom-color: rgba(34, 197, 94, 0.2);
    box-shadow: 0 6px 24px var(--dev-green-glow);
    font-family: 'Fira Code', monospace;
}

.topbar.section-3 {
    background: rgba(24, 20, 25, 0.95);
    color: var(--accent-coral);
    border-bottom-color: rgba(255, 122, 89, 0.2);
    box-shadow: 0 6px 24px var(--contact-glow);
}

.hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    text-align: center;
    width: 100%;
}

.hero-image {
    width: 100%;
    display: flex;
    justify-content: center;
}

.hero-image-content {
    width: min(380px, 100%);
    height: auto;
    object-fit: contain;
}

.hero-information {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-title {
    font-family: 'Montserrat', 'Poppins', -apple-system, BlinkMacSystemFont, sans-serif;
    font-weight: 800;
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    line-height: 1.1;
    letter-spacing: -0.02em;
    text-transform: uppercase;
    margin: 0;
}

.hero-title .jens {
    color: var(--text-primary-light);
}

.hero-title .heukers {
    color: var(--accent-coral);
}

.hero-subtitle {
    font-family: 'Inter', 'Roboto', -apple-system, sans-serif;
    font-weight: 500;
    font-size: clamp(1rem, 2vw, 1.25rem);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-secondary-light);
    margin: 12px 0 0;
}

.skills-section {
    width: 100%;
    margin-top: 60px;
}

.section-header {
    margin-bottom: 24px;
}

.section-tag,
.projects-section-tag {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 999px;
    margin-bottom: 12px;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

.section-tag {
    color: #ff0055;
    background: rgba(255, 0, 85, 0.1);
}

.section-title,
.projects-section-title {
    font-family: 'Montserrat', 'Poppins', sans-serif;
    font-size: clamp(2rem, 3vw, 2.8rem);
    margin: 0;
}

.section-title {
    color: var(--text-primary-light);
}

.section-highlight {
    color: var(--accent-coral);
}

.skills-filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 24px;
}

.filter-btn {
    border: 1px solid rgba(11, 18, 32, 0.1);
    border-radius: 999px;
    background: var(--surface-light);
    color: var(--text-secondary-light);
    padding: 8px 18px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: capitalize;
}

.filter-btn:hover {
    border-color: var(--accent-coral);
    color: var(--text-primary-light);
}

.filter-btn.active {
    background: var(--text-primary-light);
    color: var(--surface-light);
    border-color: var(--text-primary-light);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.skill-card {
    background: var(--surface-light);
    border: 1px solid rgba(0, 0, 0, 0.05);
    border-radius: 16px;
    padding: 24px;
    display: flex;
    align-items: flex-start;
    gap: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.skill-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
}

.skill-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: grid;
    place-items: center;
    font-weight: 700;
    font-size: 0.9rem;
    color: #ffffff;
    flex-shrink: 0;
}

.skill-info h3 {
    margin: 0 0 4px;
    font-size: 1.05rem;
    font-weight: 600;
    color: #111111;
}

.skill-info p {
    margin: 0;
    font-size: 0.85rem;
    color: #666666;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.skill-icon.js { background-color: #f7df1e; color: #000; }
.skill-icon.py { background-color: #3776ab; }
.skill-icon.csharp { background-color: #9b4f96; }
.skill-icon.sql { background-color: #00758f; }
.skill-icon.cpp { background-color: #00599c; }
.skill-icon.lua { background-color: #000080; }
.skill-icon.html { background-color: #e34f26; }
.skill-icon.css { background-color: #1572b6; }
.skill-icon.php { background-color: #292929; }
.skill-icon.java { background-color: #f89820; color: #000; }
.skill-icon.linux { background-color: #fcc624; color: #000; }
.skill-icon.git { background-color: #f05032; }
.skill-icon.docker { background-color: #2496ed; }
.skill-icon.cicd { background-color: #2088ff; }
.skill-icon.scrum { background-color: #0065ff; }
.skill-icon.node { background-color: #339933; }
.skill-icon.opengl { background-color: #555555; }
.skill-icon.mysql { background-color: #4479a1; }
.skill-icon.mongo { background-color: #47a248; }
.skill-icon.cmake { background-color: #064f8c; }
.skill-icon.json { background-color: #292929; }

.projects-section {
    width: 100%;
}

.projects-section-tag {
    color: var(--dev-green);
    background: var(--dev-green-glow);
    border: 1px solid rgba(34, 197, 94, 0.2);
}

.projects-section-title {
    color: var(--dev-green);
}

.projects-highlight {
    color: var(--text-primary-dark);
}

.project-modal-card {
    background: var(--dev-surface);
    border: 1px solid rgba(34, 197, 94, 0.2);
    border-radius: 20px;
    padding: 30px;
    margin-top: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5), 0 0 20px var(--dev-green-glow);
    display: flex;
    flex-direction: column;
    gap: 24px;
    text-align: left;
}

.project-display-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 16px;
}

.project-meta-info h3 {
    margin: 8px 0 0;
    font-family: 'Fira Code', monospace;
    font-size: 1.5rem;
    color: var(--text-primary-dark);
}

.project-badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 6px;
    border: 1px solid rgba(34, 197, 94, 0.3);
    background: rgba(34, 197, 94, 0.1);
    color: var(--dev-green);
    font-family: 'Fira Code', monospace;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.project-link-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 18px;
    border: 1px solid var(--dev-green);
    border-radius: 8px;
    color: var(--dev-green);
    font-family: 'Fira Code', monospace;
    font-size: 0.85rem;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.project-link-btn:hover {
    background: var(--dev-green);
    color: var(--dev-bg);
}

.project-screen-viewport {
    position: relative;
    width: 100%;
    height: 400px;
    border-radius: 12px;
    overflow: hidden;
    background: #0b0f0d;
    border: 1px solid rgba(34, 197, 94, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-active-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.9;
}

.viewport-overlay-tag {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 4px 10px;
    border-radius: 4px;
    border: 1px solid rgba(34, 197, 94, 0.2);
    background: rgba(18, 24, 20, 0.85);
    color: var(--dev-green);
    font-family: 'Fira Code', monospace;
    font-size: 0.75rem;
    z-index: 2;
}

.slider-nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 40px;
    height: 40px;
    border: 1px solid rgba(34, 197, 94, 0.3);
    border-radius: 50%;
    background: rgba(18, 24, 20, 0.7);
    color: var(--dev-green);
    display: grid;
    place-items: center;
    cursor: pointer;
    z-index: 3;
}

.slider-nav-btn:hover {
    background: var(--dev-green);
    color: var(--dev-bg);
    border-color: var(--dev-green);
    box-shadow: 0 0 10px var(--dev-green-glow);
}

.prev-btn { left: 16px; }
.next-btn { right: 16px; }

.viewport-thumbnails {
    position: absolute;
    bottom: 12px;
    right: 12px;
    display: flex;
    gap: 6px;
    z-index: 3;
}

.thumb-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    border: 1px solid rgba(0, 0, 0, 0.5);
    background: rgba(255, 255, 255, 0.3);
    cursor: pointer;
    transition: all 0.2s ease;
}

.thumb-dot:hover {
    background: rgba(255, 255, 255, 0.7);
}

.thumb-dot.active {
    background: var(--dev-green);
    border-color: var(--dev-green);
    box-shadow: 0 0 6px var(--dev-green);
    transform: scale(1.2);
}

.project-details-body {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.project-details-body p {
    margin: 0;
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-secondary-dark);
}

.project-tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tech-tag {
    padding: 4px 10px;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary-dark);
    font-family: 'Fira Code', monospace;
    font-size: 0.8rem;
}

.project-selector-bar {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding-top: 16px;
    border-top: 1px solid rgba(34, 197, 94, 0.15);
}

.selector-label {
    font-family: 'Fira Code', monospace;
    font-size: 0.8rem;
    color: var(--text-secondary-dark);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.selector-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.proj-select-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-secondary-dark);
    cursor: pointer;
    font-family: 'Fira Code', monospace;
    font-size: 0.85rem;
    transition: all 0.2s ease;
}

.proj-select-btn .dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--text-secondary-dark);
}

.proj-select-btn:hover {
    border-color: var(--dev-green);
    color: var(--text-primary-dark);
}

.proj-select-btn.active {
    background: var(--dev-green-glow);
    border-color: var(--dev-green);
    color: var(--dev-green);
}

.proj-select-btn.active .dot {
    background: var(--dev-green);
    box-shadow: 0 0 8px var(--dev-green);
}

.contact-section {
    width: 100%;
}

#section-3 .panel-inner {
    text-align: left;
}

.contact-section .section-header {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    margin-bottom: 24px;
}

.contact-section .section-tag {
    color: var(--accent-coral);
    background: var(--contact-glow);
    border: 1px solid rgba(255, 122, 89, 0.3);
}

.contact-section .section-title {
    color: var(--text-primary-dark);
}

.contact-section .section-highlight {
    color: var(--accent-coral);
}

.contact-card {
    width: 100%;
    padding: 0;
    border: 1px solid rgba(255, 122, 89, 0.2);
    border-radius: 20px;
    background: #111318;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5), 0 0 20px var(--contact-glow);
    overflow: hidden;
}

.console-shell {
    display: flex;
    flex-direction: column;
}

.console-toolbar {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: linear-gradient(90deg, rgba(255, 122, 89, 0.2), rgba(255, 122, 89, 0.05));
    border-bottom: 1px solid rgba(255, 122, 89, 0.22);
    font-family: 'Fira Code', monospace;
    font-size: 0.8rem;
    color: #ffd8cc;
}

.console-title {
    color: #ffd8cc;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.console-body {
    padding: 20px 22px 24px;
    background: linear-gradient(180deg, rgba(8, 12, 17, 0.98), rgba(13, 17, 24, 0.98));
    font-family: 'Fira Code', monospace;
}

.console-line {
    margin: 0 0 10px;
    color: #ffd8cc;
}

.console-prompt {
    color: var(--accent-coral);
}

.contact-form .form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 18px;
}

.contact-form label {
    font-size: 0.85rem;
    font-weight: 600;
    color: #d1d5db;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid rgba(125, 211, 252, 0.2);
    border-radius: 8px;
    background: rgba(2, 6, 23, 0.85);
    color: #f8fafc;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.01);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
    color: #64748b;
}

.contact-form input:focus,
.contact-form textarea:focus {
    border-color: var(--accent-coral);
    box-shadow: 0 0 0 2px rgba(255, 122, 89, 0.18);
    outline: none;
}

.contact-submit-btn {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid rgba(255, 122, 89, 0.3);
    border-radius: 8px;
    background: rgba(255, 122, 89, 0.12);
    color: #ffe1d6;
    font-family: 'Fira Code', monospace;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s ease, box-shadow 0.2s ease;
}

.contact-submit-btn:hover {
    background: rgba(255, 122, 89, 0.2);
    box-shadow: 0 0 12px rgba(255, 122, 89, 0.16);
}

.contact-status {
    margin: 0 0 12px;
    padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid rgba(125, 211, 252, 0.2);
    background: rgba(125, 211, 252, 0.08);
    color: #e0f2fe;
    font-size: 0.92rem;
}

.contact-status.success {
    border-color: rgba(74, 222, 128, 0.35);
    background: rgba(74, 222, 128, 0.14);
    color: #dcfce7;
}

.contact-status.error {
    border-color: rgba(255, 122, 89, 0.35);
    background: rgba(255, 122, 89, 0.14);
    color: #ffd8cc;
}

@media (max-width: 768px) {
    .section-panel {
        padding: 88px 16px 40px;
    }

    .project-modal-card {
        padding: 20px;
    }

    .project-screen-viewport {
        height: 260px;
    }

    .slider-nav-btn {
        width: 32px;
        height: 32px;
    }

    .contact-card {
        padding: 24px;
    }
}

@media (max-width: 768px) {
    .contact-card {
        padding: 20px;
    }
}